HI, 

Can anyone help please.

A little back ground, We had the timing belt changed, and other bits like clutch etc, the car was all back together sounding great, then it stopped, sounded like an old taxi, it turned out the timing belt jumped a tooth, that was corrected but now sounds tappy, but runs okay but a little rough. So i imagine it has done something to a valve or two. 

 we had a symptom that it would drink the petrol, so my partner changed the lambda sensors on both pre and post, car not thirsty any more,  i took it back for re-test and the emissions are still high, while at the MOT garage some guy turned up, and said, there is a hose that can split and that can cause problems, but i didn't get a chance to question him on what he was talking about. 

Can the valves cause the emissions to be high, what are the chances the cat convertor is damaged? when driving home a couple times it wanted to stall and the engine management came on with  a red light when it stalled.

spent so much money, i don't want to give up.. 

 

thanks for reading

 

Which emissions did it specifically fail on?  HC, CO or lambda?

23 minutes ago, TomsFocus said:

Which emissions did it specifically fail on?  HC, CO or lambda?

All basically

 

Fast idle  

CO 2.88%

HC 152PPM

the funny looking symbol ~ 0.940 

Second IDLE 

CO 2.48%

HC 182PPM

0.950 

Natural IDle 

CO 4.28% 

Just now, nikki188 said:

FAst idle  

CO 2.88%

HC 152PPM

the funny looking symbol ~ 0.940 

Second IDLE 

CO 2.48%

HC 182PPM

funny symbol 0.950

Natural IDle 

CO 4.28% 

 

2 hours ago, nikki188 said:

All basically

 

Fast idle  

CO 2.88%

HC 152PPM

the funny looking symbol ~ 0.940 

Second IDLE 

CO 2.48%

HC 182PPM

0.950 

Natural IDle 

CO 4.28% 

The funny symbol is lambda.

HCs are a fast pass at below 200ppm.  Lambda is only slightly out.  Should be 0.97.

That CO is horrendous though, should be less than 0.3%!  The cat is probably knackered. 

Though I'd say the fuel isn't being completely burnt before entering the exhaust.  That's the reason for the low lambda readings and high HCs.  It could be weak spark plugs, but I'd say it's more likely to be a valve leak, timing still wrong or a loss of compression.

I wouldn't change the cat until you can get this over-fuelling issue fixed.

Has a compression test been done since the timing was fixed?

 

If its not that far out thrown some cleaner down its neck and give it a good blast, usually sorts it for the test.

I'd be concerned about the jumped tooth and any resulting damage done.